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Open descending-bid auctions (Dutch auctions) are those in which the price is set by the auctioneer at a level sufficiently high to deter all bidders, and is progressively lowered until a bidder is prepared to buy at the current price, winning the auction.
In a lowest unique bid auction, the bidder who submitted the single bid of $0.06 would win the auction, and would be eligible to purchase the product or service for $0.06, because their bid was the lowest unique bid. In a highest unique bid auction, the bidder who submitted a bid of $0.09 would win the auction.
In an English auction, all current bids are visible to all bidders and in a sealed-bid auction, bidders only get to know if their bid was the best. Best/not best auctions are sealed-bid auctions with multiple bids, where the bidders submit their prices like in English auction and get responses about the leadership of their bid. [74]
Note that with this bidding function, the player with the higher value still wins. We can show that this is the correct equilibrium bidding function in an additional way, by thinking about how a player should maximize his bid given that all other players are bidding using this bidding function. See the page on first-price sealed-bid auction.
The company who wrongly estimated at $20 million and placed a bid at that level would win the auction, and later find that it was not worth as much. Other auctions where the winner's curse is significant: Spectrum auctions in which companies bid on licenses to use portions of the electromagnetic spectrum.
Unlike sealed-bid auctions (such as first-price sealed-bid auction or Vickrey auction), an English auction is "open" or fully transparent, as the identity (or at least the existence) of all bidders and their bids is disclosed to each other during the auction. More generally, an auction mechanism is considered "English" if it involves an ...
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